Dumbarton monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Dumbarton

Dumbarton average temperature chart (Celsius) Dumbarton average temperature chart (Fahrenheit)
Average monthly temperatures in Dumbarton (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 5.5 5.7 7.8 10.7 14 16.7 17.9 17.6 14.9 12 8 6.3
°F 41.9 42.2 46 51.2 57.1 62.1 64.2 63.6 58.9 53.5 46.4 43.4

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Dumbarton monthly rainfall chart (mm) Dumbarton monthly rainfall chart (inches)
Average monthly rainfall in Dumbarton (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 169 112 136 79 94 85 94 126 169 175 163 162
inches 6.7 4.4 5.4 3.1 3.7 3.4 3.7 4.9 6.7 6.9 6.4 6.4
Rainy days 22 17 20 16 17 16 17 18 20 21 20 21

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Dumbarton

Dumbarton average daily sunshine chart
Average daily sunshine Dumbarton
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 1.4 2.5 3.3 5.3 6.2 6.4 5.7 5.1 3.9 2.8 2 1.3

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Dumbarton average minimum / maximum temperatures (Celsius) Dumbarton average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Dumbarton (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 0.8 0.6 1.9 3.4 6.1 8.9 10.6 10.5 8.7 6.5 2.9 1.6
Max °C 5.6 5.8 8 10.9 14.2 16.9 18.1 17.8 15.1 12.1 8.2 6.5
Min °F 33.4 33.1 35.3 38 42.9 48 51 50.8 47.7 43.7 37.1 34.8
Max °F 37.8 37.8 40.8 44.8 50.2 55.2 57.7 57.4 53.4 48.7 41.9 39.2

Sea temperature

The graph below shows the average sea temperature.

Dumbarton average sea temperature chart (Celsius) Dumbarton average sea temperature chart (Fahrenheit)
Average sea temperature around Dumbarton in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.1 6.9 6.8 7.8 9.8 12 13.8 14.7 14.5 13.6 11.9 9.9
°F 46.5 44.4 44.2 46.1 49.6 53.6 56.9 58.4 58.1 56.4 53.4 49.8

Wind speed

The graph below shows the average wind speed.

Dumbarton average winspeed by month (km/h) Dumbarton average winspeed by month (mph)
Average wind speed in Dumbarton (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 18 17 19 17 16 16 15 14 16 17 18 18
mph 11 11 12 10 10 10 9 9 10 11 11 11

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Dumbarton relative humidity averages
Average relative humidity in Dumbarton
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
90% 87% 83% 79% 77% 79% 81% 83% 86% 88% 89% 91%

Other monthly averages

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Dumbarton weather stats

Dumbarton weather statistics
Hottest month: July 17.9°C 64.2°F
Driest month: April 79mm 3.1ins
Sunniest month: May 6.2hrs
Coldest month: January 5.5°C 41.9°F
Wettest month: October 175mm 6.9ins
Warmest sea: August 14.7°C 58.5°F
Map showing location of Dumbarton (55.94433, -4.57061)

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